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What is the size of the observable universe?

Answer 1

As of now, the first formed stars are about 13.82 billion years old. HST-discovered-galaxy GN-z11 is a little younger but farthest. So, the tentative size of observable universe is 2 X 13.82 bly.

Over time, these approximations may be revised to account for higher-than-before limits as telescope technology continues to advance.

By extrapolation, the size 27.64 bly includes a virtual antipodal universe of size 13.82 bly that has not yet been discovered.

Here is a link to the Hubble Space Telescope's discovery of the furthest galaxy: universetoday.com/farthest-galaxy-ever/viewedby-hubble-telescope/

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Answer 2

Hailey Alexander

The radius of the observable universe is approximately 46.5 billion light-years.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.